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On Sat, Oct 14, 2017 at 01:21:58AM +0200, Wojtek Porczyk wrote:
> On Sat, Oct 14, 2017 at 01:20:13AM +0200, Marek Marczykowski-Górecki wrote:
> > You can't reload partition table while it is used (something from there
> > is mounted). At least Linux doesn't support it.
>
> Just tested with loop device, fdisk, and ext4. Looks like it works. Unless it
> works only with loop?
No, it doesn't work, at least not directly:
[root@testvm user]# truncate -s 10G test.img
[root@testvm user]# losetup -f -P --show test.img
/dev/loop0
[root@testvm user]# fdisk /dev/loop0
(...)
Created a new partition 1 of type 'Linux' and of size 10 GiB.
Command (m for help): w
The partition table has been altered.
Syncing disks.
[root@testvm user]# blockdev --rereadpt /dev/loop0
[root@testvm user]# mkfs /dev/loop0p1
(...)
[root@testvm user]# mount /dev/loop0p1 /mnt
[root@testvm user]# truncate -s 20G test.img
[root@testvm user]# losetup -c /dev/loop0
[root@testvm user]# fdisk /dev/loop0
(...)
Command (m for help): p
Disk /dev/loop0: 20 GiB, 21474836480 bytes, 41943040 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x75e36dce
Device Boot Start End Sectors Size Id Type
/dev/loop0p1 2048 41943039 41940992 20G 83 Linux
Command (m for help): w
The partition table has been altered.
Calling ioctl() to re-read partition table.
Re-reading the partition table failed.: Device or resource busy
The kernel still uses the old table. The new table will be used at the next
reboot or after you run partprobe(8) or kpartx(8).
I wonder on what conditions partprobe would work. And how would mounted
filesystem react for it.
- --
Best Regards,
Marek Marczykowski-Górecki
Invisible Things Lab
A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?
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